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Short for picture element, a pixel is a single point in a graphic image. HP TouchSmart PCs, All-in-One PCs and LCD flat panel monitors display pictures by dividing the display screen into thousands (or millions) of pixels, arranged in rows and columns. The pixels are placed close together so that they appear connected.

A full pixel is a combination of one red, one green, and one blue sub-pixel.

What are pixel and sub-pixel defects?

A full pixel defect is a bright white dot or very noticeable black dot on the display. No full pixel defects are allowed per HP's monitor specification.

A sub-pixel defect is also referred to as a dot defect.

Bright dot sub-pixel defects are permanently "on", displaying a colored red, green, or blue spot on the display at all times.

Dark dot sub-pixel defects are permanently "off", displaying a black dot on the display at all times.

A different type of defect caused by microscopic contaminants within the manufacturing process can also be found. Contamination results in a dark "stain" covering one or several sub-pixels. They are not pixel or sub-pixel defects per say. No contamination is allowed under HP policy.

Dark sub-pixel defect - In this image, a dark spot on a white background results from a green sub-pixel, which is in the "off" or dark state.

Bright sub-pixel defect - In this image, a bright spot on a black background is caused by sub-pixels (in this case, a red sub-pixel) in the "on" state.

Debris trapped within the LCD structure can result in dark spots, but under magnification these are distinguished from an "off" sub-pixel, as the shape of the contaminating particle is visible.

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The information contained herein is subject to change without notice. The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting an additional warranty. HP shall not be liable for technical or editorial errors or omissions contained herein.